Cryopreservation of mouse morulae through different methods: slow-freezing, vitrification and quick-freezing - Mello, Marco Roberto Bourg de; Queiroz, Vinícius Seixas; Lima, Alessandra Sobreira de; Tavares, Liliam Mara Trevisam; Assumpção, Mayra Elena Ortiz D'Ávila; Wheeler, Mathew B.; Visintin, Jose Antonio (Brazilian Journal of Veterinary Research and Animal Science, 2001)